At music festivals, every fan has to grapple with tough scheduling conflicts that force them to choose one act over another. It's just part of the game. Backstage at Lollapalooza, Deadmau5 tells Rolling Stone that, this summer, he's repeatedly had to deal with going head-to-head with the Foo Fighters. It happened at Lollapalooza this past weekend and it happened at festivals all over Europe before then. "So it's another day at the office for us," he says, casually. "They've got to put up with me and I've got to put up with them." Having collaborated with the Foo Fighters before on a remix, he assures Rolling Stone that, in truth, there's no hard feelings.